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A list of participants in a collaborative group may also be included in the Acknowledgment (see , Authorship Responsibility, Group and Collaborative Authorship). However, a lengthy acknowledgment may occupy an excessive amount of journal space. Some editors have proposed limits on the length of an acknowledgment (eg, 1 column of a journal page or 600 words of reduced type), but such limits seem contrary to commitments to greater transparency of the contributions to scientific publication, and journals should carefully evaluate the appropriateness of any limits on the length of acknowledgments. Yet the need to credit assistance from individuals, especially in

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